Lathe attachment for turning taper surfaces.



E. LT'MILLS L J. W. WHITFORD. LATHE ATTACHMENT PoR TURNING TAPEN sU-RFAGNS.v

APPLICATION FILED JUNE-'7, 1 911.

Patented July 9, 1912.

l r lllllllllllllllllll HERR/WHA NW y s. Z Z n 4 Z E @5M w M MQW EDWARD LEWISMILLS, QE'FITCHBURG, ,MAssAcrinsnTTs AND .ICHN'WALTER `vil-HIT.

FORD, oaJEnsEY CITY, Nnwarnnsnr, AssIeNoRsTo FITCHBURC MACHINE Worms;y

or FITCHBURG, MAssACH-UsETTs,A ConroR-ATIoNor MASSACHUSETTS.'

LATHE ATTACHMENT ron. TURNING TAPER sunraons.

Specification of Letters Patent.

Patented July 9, 1:9172.

Application filedA .Tune 7,` 191,1. Serial No. 631,814.- v

T0 all ulzom 'it may concern l Be it known that we, `EDWARD LEWIS MILLS and JOHN VALTER VHITFORD, respec-v tively of Fitchburg, in the count-y of Yorcester and State of Massachusetts, and of Jersey Cit-y, in the county of Hudson and State of New Jersey, have invented certain new and usefullmprovements in Lathe Attachments for Turning Tapery Surfaces,y ofI which the following is a specification.

The object of the present invention is to provide means adapted' to be attached to a lathe foiturning taper Surfaces.

The attachment comprises a tool block intended to be fixed to a feed carriage, atool mounted in the block so as to be' movable transversely ofthe axisof the work, anda teinplet adapted to be anchored toa 'suitable fixture of the lathe for controlling theltransverse movement of the tool.

I I In this embodiment of the invention the ytemplet is formed' and arranged to. hold the tool against thework,- and spring ltension mechanisni is provided for retracting the tool so as to keep it incoperative relation with the templet.

The invention also consists in the com bination with the movable tool of a xed tool whereby the' two tools carried bythe same tool block may act independently to pro-i duce a tapering poitionand a cylindricportion, or a tapering portion and a transverse shoulder. One of the features pertaining toy the'combination of these two toolsis the arrangement ofthe movable tool whereby its Cutting portion .is brought close to the c`ut` ting portion of theXed tool.

Of the accompanying A,drawings which illustratev one form in f which-the invention may be embodied: Figure l represents a'top plan view of the tool block and templet.

Fig. 2 represents a longitudinal vertical section thereof ina plane indicated in Fig. l by line 2 2.v Fig. 3 represents a. side elevation oft-he tool block. Fig. 4 represents a vertical section in a plane indicated in' Fig.

V1 by line4-4. Fig. 5 represents aneleva-v tion of ,the inner end of the ta er-turning tool, and'itsadjusting device. 1g.6.repre sents a cross section in the plane indicated in Fig..3 by line 6.6.

The saine reference characters indi-cate the saine partsjwherever they occur.

The tool block, indicated at 10, is formed v ger.

vwith a dovetail groove in its lower surface whereby 'it is adapted to be mounted upon a v feed carriage 11 having a rib 12 formed toV tit in the groove ofthe tool block. A'gibfl vinterposed between the rib'lQand a portion of the tool block is adaptedpto be'forced against the rib to tix the position of the tool block with relation. to the lcarriage.` For4 this purpose the tool block is provided. with setscrews lllA and thrust rods 15 for transmitting the pressure of the .setscrews to the gib.

` The tool block is formed with a socket open at both ends for thev reception of aj plunger or tool holder 1G. A :tool 17 for turning taper surfaces is mounted in the plunger, the plunger being formed with a suitable socket of the same cross section as the tool. The plungeris adapted .to slide longitudinallyin the tool block for the pur-v pose of obtaining the tapering effect, and

the tool is adapted to slide longitudinally in j is such as to permit rotation of the former, whereby a screw adjustment may be 1mparted to the tool. Aside from the adjusting movement thus provided, the tool is rigid with` relation to the plunger. A collar 23 loosely surrounding the outer end of the member 20 is provided Awith a letscrew 2i.

by which it may be secured to the member 20 at any desired position. The collar is: provided with index marksI 25 which" :ii-1,l adaptedl to be read in conjunction with an index member 26 projecting from the plun This adjustingiueans and index do not forni any part of the present invention and are not'herein claimed. A bushing v`2T surrounding the plunger at the end nearer Anection between the member Q0 and the tool y the index device is affixed in vthe toolblock to provide a suitable bearing in -which the plunger may lslide. A collar QS hai-ing a b'ossBO .(see Fig. 4) is afiixed tothe plunger by screws 29, andv its function isto transmit movemcntto the plunger for moving the tool toward and from the work. The boss is fitted to slidein a Vslot 31 in the upper side of the tool block. One face of the boss 30 is engaged'by spring tension means for retractng the tool from the work While the opposite face vof the boss is adaptedto coactwith a templet for holding, the tool againsty the work. The spring tension means, as shown by Fig. 2, comprisesv a` sliding barrel 32 and spring 33 contained in'a socket in the tool block. The'templet, indicated at 34,

is formed with a Working facer for engag ingthe boss 30, and with a face 36 for en gaging anabutment 37 alliXed to the tool block. The templet is affixed to a stationary holder 38 in such position that the face 36" is parallel to the path ofrfeeding movement of the carriage 11.

The working surface 315 maybe of any de.

sire'd formation, depending upon the chars acter of the work to be produced. As shown by Fig. 1, the surface is straight and is inclined with relationto the surface 36, and

it is adapted t'o produce a uniform tapering surface on the work. The 'tool block, according to the arrangement shown by Fig. 1, is intended to befed fronithe top toward the bottom of the drawing. The tool 17 wouldtherefore begin cutting the smaller end of the tapering -portionv andgwonld"y retracted `.by the spring-33 as the carnage is fed, theretractory movement of theitool being controlled' by the templet 34.' Un'der some conditions it might be desirable to feed` the carriage in the opposite direction, 'in which case the tool'would Ibegin at the larger end of the taper and would be moved toward the axis of the work by theiteniplet.

The tool block is provided with a recess open atK4 one side for the reception of atool 40. .The faces 39 and 42 of the' tool block are at an acute angle and the tool is formed with faces at a similar angle which are held against those of the tool block by set screws A micrometer adjusting screw 43 lis threaded in the tool block for adjusting the tool 40. The screw 43 is formed with a col-` 'dicated at 4S, into which the collar 44 may be inserted instead of intol thelnotch 47.'

The notch 48 would be used ifl it were desirable to place the tool 40 nearer the axis of the Work or if the cut-ting endof the tool were so worn away as to require advancement of the tool. Y

The axis' of the socket in lwhich the plunger vl'slides is at right angles to the axis of the work. It will be observed by referring to Fig. 1 that the axis of the tool'17 and the adjusting member 2O is inclined' with relation to the aX'is ofthe plunger in such manner as to lace the point of ,the tool 17 in close relation to thel tool 40. This arrangementl of vthe tools is desirable because it enables them to work within relatively close limits. g y

In producing a piecel of work of the character represented in Fig. 1, the tool 17 produces the tapering portion and the tool 40 produces the cylindric portion w and shoul- It is oftentimes desirable to retract y der :112. the tool 17 to inoperative position and to use the tool 40alone. For this reason the templet holder 38 is mounted upon 4a pivot stud 49 supported by a xture 50. This manner of mounting the templet makes V it possible to 4lift the templet. away from the tool block,whereupon the tool will be further retractedfby the spring 3.3. When the tool is thus retracted, the tem let may be permitted torest uponthetop .o the boss 30 ormay be otherwise supported.

We claim: l

I 1. lIn-a metal-working machine, the'com-L n binati'on with a feed carriage, a tool block Y, aflixed thereto, and 'a tool aixed on the block for formingva cylindric surface., of a tool' mounted on said 'block to slide close to '100 said fixed tool, andl a templet adapted to cause movement of said sliding tool with relation to the fixed tool block when the feed carriage is moved, whereby a non-cylindric surface maybe vformed tojoin a cylindric surface producedv by saidfxed tool.l

1 2..In al metal-working machine, a feed carriage, a tool block thereon, a tool holder fitted to slide in a bearin in said block, a templet, said tool holder aving a shoulder adapted to coact with said templet,said templet being mounted to swing about a pivot tension mea keep said shoul'der against the templet.

In a metal-working machine, a tool block, a tool' holder fitted ',to slide in a bear- Vtherein, tool mountedV ony said block -1n ependently of said' holder, and a tool mounted in said holderV at an angleto the ylos to and from operative position, and spring actlng on said tool holder to line ofl sliding move/meentof the holder, -I whereby the cutting ends of Ithe tools may be arranged ,close to each other. l

4. In4 a 'metal-working machine, a tool block, a tool holder fitted'to slide therein and having a recess, a tool fitted to slide in -said recess, and 'means for securing the tool in the holder, the line of sai-d recess being at an uncle tothe line of movement of the holder wlth relation to the tool block.

".aces,.a screw in threaded engagement with the tool block and having a collar adapted to-'fit between said confronting faces of the tool, a 'series of index marks on said collar, and an index on said tool block adapted to coperate with saidA series of index marks.

7. In ametal-workng machine, a tool block having' a tool recess open at one side for lateral insert-ion and removal of a tool,

a tool having longitudinal faces at an acute angle to each other in cross section, said tool block having faces at a similar angle for supportin the tool, and a setscrew threaded in sald tool block and adapted to force the tool 'against both of said faces of the tool bleek. v

In testimony whereof we have aiiXed our signatures, in presence of two witnesses.

EDWARD LEWIS MILLS. JOHN WALTER VVHITFORD. Witnesses to the signature of Edward Lewis Mills:

LOWELL-H. STEARNS, RUSSELL-F. ALDRICH.

Witnesses to theA signature of John Walter Whitford:

LEON ERVIN, WILLIAM RANKtg.

Copies of this patent may bel obtainedvfor ve centseach, by addressing the Commissioner of Patents.

Washington, I).` G. 

